This article is from the Astronomy FAQ, by Joseph Lazio (jlazio@patriot.net) with numerous contributions by others.
See Part 1 of this FAQ, and
<URL:http://seds.lpl.arizona.edu/billa/tnp/>,
<URL:ftp://phobos.sscl.uwo.ca/pub/Space>,
<URL:http://bang.lanl.gov/solarsys/>,
<URL:http://www-pdsimage.wr.usgs.gov/PDS/public/mapmaker/mapmkr.htm>,
and <URL:http://wwwflag.wr.usgs.gov/USGSFlag/Space/>.
 
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